What can NAC do?
It’s a system that verifies the identity and permissions of every user or device, enforces specific security policies, and swiftly eliminates threats related to unauthorized access. It automatically recognizes who is trying to enter your network (whether it’s a computer, smartphone, or printer), assesses their security status, and decides what they can see and what they can access based on that assessment.
Why use NAC systems?
Above all, they strengthen network security, help prevent the spread of viruses and other malicious software, and support companies in meeting legal and industry requirements.
NAC operates dynamically—it continually adjusts access levels, responding to who the user is, the condition of their device, and the situation across the entire network. Thanks to this, your data and resources are protected both from external attacks and from misuse by people already working at the company.
Main tasks of NAC in practice
- User and device authorization: Verifying who wants to access the network and from which device.
- Access control: Deciding which parts of the network are available to certain people or devices according to predefined rules.
- Endpoint security monitoring: Checking whether connected devices meet requirements—such as having up-to-date software and active antivirus protection.
- Enforcement of security policies: Isolating suspicious or untrusted devices through the system’s automatic actions.
- Network segmentation: Dividing the network into logical sections, thereby reducing the risk of threats spreading and simplifying access management.
What makes up an effective NAC system?
- NAC server: The central management point—it determines who can access the network, logs every connection, and enforces security policies.
- NAC agents on devices: Small programs installed on computers, phones, or other devices; they cooperate with the NAC server and provide information about the security status.
- Network components: Switches and access points that, together with the NAC system, block or allow physical network access.
- Access policies: A set of rules—who, on which device, and under what conditions can use network resources.
- Integration with Cyber Threat Intelligence (CTI), e.g., Sycope: Modern NAC systems use external sources of up-to-date threat information. Tools like Sycope analyze data from multiple sources, build current lists of potential threats, and automatically block suspicious activities.
The most popular authentication methods in NAC
- 802.1X protocol: Allows for detailed control of access to wired and Wi-Fi networks via an external server and dedicated security protocols.
- Individual accounts, certificates, and tokens: Each user can be recognized by their account, certificate, or dedicated hardware token.
- Device compliance checks: Before any access is granted, the NAC system verifies, for instance, software updates or the presence of security applications.
How does NAC protect and support a company’s growth?
NAC is not just about control—it’s also a real tool for risk management. It blocks unauthorized devices and data transfers, protects against data leaks and network infections by viruses. It also provides complete “accountability”—enabling you to easily meet legal and audit requirements, control employee access, and detect risky activities.
What’s more, integration with CTI tools, such as Sycope, ensures access to up-to-date threat intelligence and allows for immediate response to new attack methods.
Challenges and limitations in NAC implementation
- Compatibility with the existing network: Sometimes implementation requires hardware upgrades or installation of additional applications, which can generate extra costs and technical difficulties.
- Scalability: Managing many users and devices can be challenging and requires adequate system capacity, especially in large organizations.
- Impact on users: Rules that are too strict can sometimes slow down access or cause technical issues for employees.
- Potential security gaps: Even advanced NAC may not detect all types of attacks—that’s why integration with dynamic analytical tools like CTI is so important.
